/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.epoll;

import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelOption;
import io.netty.channel.MessageSizeEstimator;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.WriteBufferWaterMark;
import io.netty.channel.socket.SocketChannelConfig;
import io.netty.util.internal.PlatformDependent;

import java.io.IOException;
import java.net.InetAddress;
import java.util.Map;

import static io.netty.channel.ChannelOption.*;

public final class EpollSocketChannelConfig extends EpollChannelConfig
        implements SocketChannelConfig
{
    private static final long MAX_UINT32_T = 0xFFFFFFFFL;

    private final EpollSocketChannel channel;

    private volatile boolean allowHalfClosure;

    /**
     * Creates a new instance.
     */
    EpollSocketChannelConfig(EpollSocketChannel channel)
    {
        super(channel);

        this.channel = channel;
        if (PlatformDependent.canEnableTcpNoDelayByDefault())
        {
            setTcpNoDelay(true);
        }
    }

    @Override
    public Map<ChannelOption<?>, Object> getOptions()
    {
        return getOptions(super.getOptions(), SO_RCVBUF, SO_SNDBUF, TCP_NODELAY,
                SO_KEEPALIVE, SO_REUSEADDR, SO_LINGER, IP_TOS,
                ALLOW_HALF_CLOSURE, EpollChannelOption.TCP_CORK,
                EpollChannelOption.TCP_NOTSENT_LOWAT,
                EpollChannelOption.TCP_KEEPCNT, EpollChannelOption.TCP_KEEPIDLE,
                EpollChannelOption.TCP_KEEPINTVL, EpollChannelOption.TCP_MD5SIG,
                EpollChannelOption.TCP_QUICKACK);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T getOption(ChannelOption<T> option)
    {
        if (option == SO_RCVBUF)
        {
            return (T) Integer.valueOf(getReceiveBufferSize());
        }
        if (option == SO_SNDBUF)
        {
            return (T) Integer.valueOf(getSendBufferSize());
        }
        if (option == TCP_NODELAY)
        {
            return (T) Boolean.valueOf(isTcpNoDelay());
        }
        if (option == SO_KEEPALIVE)
        {
            return (T) Boolean.valueOf(isKeepAlive());
        }
        if (option == SO_REUSEADDR)
        {
            return (T) Boolean.valueOf(isReuseAddress());
        }
        if (option == SO_LINGER)
        {
            return (T) Integer.valueOf(getSoLinger());
        }
        if (option == IP_TOS)
        {
            return (T) Integer.valueOf(getTrafficClass());
        }
        if (option == ALLOW_HALF_CLOSURE)
        {
            return (T) Boolean.valueOf(isAllowHalfClosure());
        }
        if (option == EpollChannelOption.TCP_CORK)
        {
            return (T) Boolean.valueOf(isTcpCork());
        }
        if (option == EpollChannelOption.TCP_NOTSENT_LOWAT)
        {
            return (T) Long.valueOf(getTcpNotSentLowAt());
        }
        if (option == EpollChannelOption.TCP_KEEPIDLE)
        {
            return (T) Integer.valueOf(getTcpKeepIdle());
        }
        if (option == EpollChannelOption.TCP_KEEPINTVL)
        {
            return (T) Integer.valueOf(getTcpKeepIntvl());
        }
        if (option == EpollChannelOption.TCP_KEEPCNT)
        {
            return (T) Integer.valueOf(getTcpKeepCnt());
        }
        if (option == EpollChannelOption.TCP_USER_TIMEOUT)
        {
            return (T) Integer.valueOf(getTcpUserTimeout());
        }
        if (option == EpollChannelOption.TCP_QUICKACK)
        {
            return (T) Boolean.valueOf(isTcpQuickAck());
        }
        return super.getOption(option);
    }

    @Override
    public <T> boolean setOption(ChannelOption<T> option, T value)
    {
        validate(option, value);

        if (option == SO_RCVBUF)
        {
            setReceiveBufferSize((Integer) value);
        }
        else if (option == SO_SNDBUF)
        {
            setSendBufferSize((Integer) value);
        }
        else if (option == TCP_NODELAY)
        {
            setTcpNoDelay((Boolean) value);
        }
        else if (option == SO_KEEPALIVE)
        {
            setKeepAlive((Boolean) value);
        }
        else if (option == SO_REUSEADDR)
        {
            setReuseAddress((Boolean) value);
        }
        else if (option == SO_LINGER)
        {
            setSoLinger((Integer) value);
        }
        else if (option == IP_TOS)
        {
            setTrafficClass((Integer) value);
        }
        else if (option == ALLOW_HALF_CLOSURE)
        {
            setAllowHalfClosure((Boolean) value);
        }
        else if (option == EpollChannelOption.TCP_CORK)
        {
            setTcpCork((Boolean) value);
        }
        else if (option == EpollChannelOption.TCP_NOTSENT_LOWAT)
        {
            setTcpNotSentLowAt((Long) value);
        }
        else if (option == EpollChannelOption.TCP_KEEPIDLE)
        {
            setTcpKeepIdle((Integer) value);
        }
        else if (option == EpollChannelOption.TCP_KEEPCNT)
        {
            setTcpKeepCntl((Integer) value);
        }
        else if (option == EpollChannelOption.TCP_KEEPINTVL)
        {
            setTcpKeepIntvl((Integer) value);
        }
        else if (option == EpollChannelOption.TCP_USER_TIMEOUT)
        {
            setTcpUserTimeout((Integer) value);
        }
        else if (option == EpollChannelOption.TCP_MD5SIG)
        {
            @SuppressWarnings("unchecked")
            final Map<InetAddress, byte[]> m = (Map<InetAddress, byte[]>) value;
            setTcpMd5Sig(m);
        }
        else if (option == EpollChannelOption.TCP_QUICKACK)
        {
            setTcpQuickAck((Boolean) value);
        }
        else
        {
            return super.setOption(option, value);
        }

        return true;
    }

    @Override
    public int getReceiveBufferSize()
    {
        try
        {
            return channel.fd().getReceiveBufferSize();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSendBufferSize()
    {
        try
        {
            return channel.fd().getSendBufferSize();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSoLinger()
    {
        try
        {
            return channel.fd().getSoLinger();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getTrafficClass()
    {
        try
        {
            return Native.getTrafficClass(channel.fd().intValue());
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isKeepAlive()
    {
        try
        {
            return channel.fd().isKeepAlive();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isReuseAddress()
    {
        try
        {
            return Native.isReuseAddress(channel.fd().intValue()) == 1;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isTcpNoDelay()
    {
        try
        {
            return channel.fd().isTcpNoDelay();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_CORK} option on the socket. See {@code man 7 tcp} for
     * more details.
     */
    public boolean isTcpCork()
    {
        try
        {
            return channel.fd().isTcpCork();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_NOTSENT_LOWAT} option on the socket. See
     * {@code man 7 tcp} for more details.
     * @return value is a uint32_t
     */
    public long getTcpNotSentLowAt()
    {
        try
        {
            return Native.getTcpNotSentLowAt(channel.fd().intValue())
                    & MAX_UINT32_T;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_KEEPIDLE} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public int getTcpKeepIdle()
    {
        try
        {
            return Native.getTcpKeepIdle(channel.fd().intValue());
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_KEEPINTVL} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public int getTcpKeepIntvl()
    {
        try
        {
            return Native.getTcpKeepIntvl(channel.fd().intValue());
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_KEEPCNT} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public int getTcpKeepCnt()
    {
        try
        {
            return Native.getTcpKeepCnt(channel.fd().intValue());
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Get the {@code TCP_USER_TIMEOUT} option on the socket. See
     * {@code man 7 tcp} for more details.
     */
    public int getTcpUserTimeout()
    {
        try
        {
            return Native.getTcpUserTimeout(channel.fd().intValue());
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setKeepAlive(boolean keepAlive)
    {
        try
        {
            channel.fd().setKeepAlive(keepAlive);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setPerformancePreferences(
            int connectionTime, int latency, int bandwidth)
    {
        return this;
    }

    @Override
    public EpollSocketChannelConfig setReceiveBufferSize(int receiveBufferSize)
    {
        try
        {
            channel.fd().setReceiveBufferSize(receiveBufferSize);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setReuseAddress(boolean reuseAddress)
    {
        try
        {
            Native.setReuseAddress(channel.fd().intValue(),
                    reuseAddress ? 1 : 0);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setSendBufferSize(int sendBufferSize)
    {
        try
        {
            channel.fd().setSendBufferSize(sendBufferSize);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setSoLinger(int soLinger)
    {
        try
        {
            channel.fd().setSoLinger(soLinger);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setTcpNoDelay(boolean tcpNoDelay)
    {
        try
        {
            channel.fd().setTcpNoDelay(tcpNoDelay);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_CORK} option on the socket. See {@code man 7 tcp} for
     * more details.
     */
    public EpollSocketChannelConfig setTcpCork(boolean tcpCork)
    {
        try
        {
            channel.fd().setTcpCork(tcpCork);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_NOTSENT_LOWAT} option on the socket. See
     * {@code man 7 tcp} for more details.
     * @param tcpNotSentLowAt is a uint32_t
     */
    public EpollSocketChannelConfig setTcpNotSentLowAt(long tcpNotSentLowAt)
    {
        if (tcpNotSentLowAt < 0 || tcpNotSentLowAt > MAX_UINT32_T)
        {
            throw new IllegalArgumentException(
                    "tcpNotSentLowAt must be a uint32_t");
        }
        try
        {
            Native.setTcpNotSentLowAt(channel.fd().intValue(),
                    (int) tcpNotSentLowAt);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public EpollSocketChannelConfig setTrafficClass(int trafficClass)
    {
        try
        {
            Native.setTrafficClass(channel.fd().intValue(), trafficClass);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_KEEPIDLE} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public EpollSocketChannelConfig setTcpKeepIdle(int seconds)
    {
        try
        {
            Native.setTcpKeepIdle(channel.fd().intValue(), seconds);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_KEEPINTVL} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public EpollSocketChannelConfig setTcpKeepIntvl(int seconds)
    {
        try
        {
            Native.setTcpKeepIntvl(channel.fd().intValue(), seconds);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_KEEPCNT} option on the socket. See {@code man 7 tcp}
     * for more details.
     */
    public EpollSocketChannelConfig setTcpKeepCntl(int probes)
    {
        try
        {
            Native.setTcpKeepCnt(channel.fd().intValue(), probes);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_USER_TIMEOUT} option on the socket. See
     * {@code man 7 tcp} for more details.
     */
    public EpollSocketChannelConfig setTcpUserTimeout(int milliseconds)
    {
        try
        {
            Native.setTcpUserTimeout(channel.fd().intValue(), milliseconds);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_MD5SIG} option on the socket. See {@code linux/tcp.h}
     * for more details. Keys can only be set on, not read to prevent a
     * potential leak, as they are confidential. Allowing them being read would
     * mean anyone with access to the channel could get them.
     */
    public EpollSocketChannelConfig setTcpMd5Sig(Map<InetAddress, byte[]> keys)
    {
        try
        {
            channel.setTcpMd5Sig(keys);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Set the {@code TCP_QUICKACK} option on the socket. See
     * <a href="http://linux.die.net/man/7/tcp">TCP_QUICKACK</a> for more
     * details.
     */
    public EpollSocketChannelConfig setTcpQuickAck(boolean quickAck)
    {
        try
        {
            channel.fd().setTcpQuickAck(quickAck);
            return this;
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    /**
     * Returns {@code true} if
     * <a href="http://linux.die.net/man/7/tcp">TCP_QUICKACK</a> is enabled,
     * {@code false} otherwise.
     */
    public boolean isTcpQuickAck()
    {
        try
        {
            return channel.fd().isTcpQuickAck();
        }
        catch (IOException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isAllowHalfClosure()
    {
        return allowHalfClosure;
    }

    @Override
    public EpollSocketChannelConfig setAllowHalfClosure(
            boolean allowHalfClosure)
    {
        this.allowHalfClosure = allowHalfClosure;
        return this;
    }

    @Override
    public EpollSocketChannelConfig setConnectTimeoutMillis(
            int connectTimeoutMillis)
    {
        super.setConnectTimeoutMillis(connectTimeoutMillis);
        return this;
    }

    @Override
    @Deprecated
    public EpollSocketChannelConfig setMaxMessagesPerRead(
            int maxMessagesPerRead)
    {
        super.setMaxMessagesPerRead(maxMessagesPerRead);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setWriteSpinCount(int writeSpinCount)
    {
        super.setWriteSpinCount(writeSpinCount);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setAllocator(ByteBufAllocator allocator)
    {
        super.setAllocator(allocator);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setRecvByteBufAllocator(
            RecvByteBufAllocator allocator)
    {
        super.setRecvByteBufAllocator(allocator);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setAutoRead(boolean autoRead)
    {
        super.setAutoRead(autoRead);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setAutoClose(boolean autoClose)
    {
        super.setAutoClose(autoClose);
        return this;
    }

    @Override
    @Deprecated
    public EpollSocketChannelConfig setWriteBufferHighWaterMark(
            int writeBufferHighWaterMark)
    {
        super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
        return this;
    }

    @Override
    @Deprecated
    public EpollSocketChannelConfig setWriteBufferLowWaterMark(
            int writeBufferLowWaterMark)
    {
        super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setWriteBufferWaterMark(
            WriteBufferWaterMark writeBufferWaterMark)
    {
        super.setWriteBufferWaterMark(writeBufferWaterMark);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setMessageSizeEstimator(
            MessageSizeEstimator estimator)
    {
        super.setMessageSizeEstimator(estimator);
        return this;
    }

    @Override
    public EpollSocketChannelConfig setEpollMode(EpollMode mode)
    {
        super.setEpollMode(mode);
        return this;
    }
}
